采用全新设计的大功率微重力热管，对大功率空间全固态激光器实施高效传导冷却，实现了对激光放大器废热的有效耗散，获得高光束质量、高功率的激光输出。鉴于激光板条放大器的主要热源为抽运激光二极管(LD)叠层及板条增益介质，实验设计了新型放大器散热结构，分别采用单通道和并行双通道微重力热管对两级串接放大器进行散热实验。结果表明，两级放大器热沉的温度均可稳定在设定的LD工作温度范围内，获得平均功率大于20 W，放大倍数大于20倍，光束质量因子M2x，M2y控制在1.42和1.31的激光脉冲输出。

The novel high power micro-gravity heat pipes are applied for the conduction cooling of a high power and high repetition space-based all-solid-state laser. The waste heat of laser amplifiers can be dissipated effectively and thereby the laser output with high beam quality and high power is obtained. In view of the pumping laser diode (LD) stacks and slab gain medium being major thermal sources in slab amplifiers, the novel amplifier structures for heat dissipating are designed. In the experiment, the heat-sinking capability of two stage simulated amplifiers in series is measured with the single-channel micro-gravity heat pipe and the two-channel micro-gravity heat pipe, respectively. The experimental results show that the temperature of both stage pre-amplifiers stabilizes in the range of operating temperature for the laser diode array. In the end, the average output power more than 20 W, magnification times greater than 20, M2x of 1.42 and M2y of 1.31 are achieved successfully.